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Issues in handling staged construction analysis for segmental bridges


Especially for segmental bridges, staged construction analysis is highly essential. There should be no failure at any stages, so it is required to simulate the construction sequences. Modeling must be appropriately done to capture each stage accurately.

What highly-skilled engineers need is to automate the manual labors of grouping, defining tendon profiles and linking materials while considering complex engineering issues like numerous stages, multiple tensioning, and time-dependent creep and shrinkage properties.


Features and process that help designing and checking construction for Segmental bridges

Segmental Process.png

Significant Features and Differences in Results

  1. 1. Modeling Wizard: Eliminates the tedious process of the manual grouping of the model, defining tendons and setting up construction stages
    •     - Contains wizards for all construction methods
    •     - Could define one finite element with two different properties, considering both pre-composite and composite
  2. 2. Analysis Control: various analysis options
    •    - Nonlinearity & p-delta
    •    - Time-Dependent Materials: considers creep/shrinkage, compression strength, and secondary effects are considered
  3. 3. Construction Stage Analysis Results
    •   - Detailed stress loss breakdowns
    •   - Measure and control camber
    •   - Clear and accurate results
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PrePost Engineer 1 - Midkiff AECOM.png

I used Prestressed loads portion of the program to define the tendon profile. For me, defining the tendon in midas Civil’s manner is more intuitive. Nice thing about using this tool in midas, you can do all the calculation work in excel and copy the cells into the tool. Makes it easier for initial profile settings or if I want to adjust anything later in the design.

Doug Midkiff at AECOM

PrePost Engineer 2 - Tony Ledesma WSP.png

Typically, you would use a special software like midas Civil to simulate the stage construction. Typical software packages don’t allow you to actually have separate models/structures joined together in a same model. So you need a special s/w to allow unconnected structures to account the time dependent effects and loading history on the structure.

Tony Ledesma at WSP